Version: (using KDE 4.2.2) OS: Linux Installed from: Ubuntu Packages I have had this problem since first upgrading to kde 4; when I visualize the source code of a web page, moving to a high column count (some thousands) kate becomes extremely slow, to the point that it requires several tens of seconds to highlight a short string of text. It works as expected in the same file and even the same line at low column numbers, though.
Sorry, this is a CANTFIX. Look at bug 169549 comment 2 Thanks *** This bug has been marked as a duplicate of bug 169549 ***